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--- howto:vboxhowto [2012/12/23 18:29] – admin
+++ howto:vboxhowto [2021/03/04 01:04] – admin
@@ Line 1: / Line 1: @@
 ====== Oracle VM Virtual Box Tricks ======
+===== How to compact VM disk file =====
+For Linux VM, first you need to zero out the data on the disk:
+  sudo dd if=/dev/zero of=zero.tmp bs=10M; rm -f zero.tmp
+zerofree command should be better but there are problems running it on Ubuntu systems
+Next shutdown the VM and run the VBoxManage.exe modifyhd compact
+  c:\Program Files\Oracle\VirtualBox>VBoxManage.exe modifyhd "c:\VirtServer\VmDiskFile.vdi" compact
+==== Reference ====
+  * https://www.ateam-oracle.com/methods-of-compacting-a-disk-image-file
+  * https://askubuntu.com/questions/1092812/zerofree-on-ubuntu-18-04
 ===== How can I start a VM without getting a window? =====